Gas burner



A. N. ROTH June 5, 1934.

GAS BURNER Filed Jan. 4, 1952 FIG. 2.

FIG. 1.

INVENTOR ADOLF N. R

ATTORNEY.

Patented June 5, 1934 UNITED STATES PArENr FFICE 1 Claim.

This invention relates to gas burners and more particularly to Bunsenburners for consuming natural gas.

The principal object of the invention is to adapt Bunsen burners toefficiently burn. natural gas.

Another object is to increase the ratio of air aspirated into the burnerto improve the combustibility of the gas mixture.

Another object is to raise the thermal efficiency of the burner.

Another object is to prevent carbonization of the gas flame, as in priornatural gas Bunsen burners, wherein incomplete combustion of the gasproduces incandescent carbon particles resulting in an objectionableyellow flame.

Another object is to insure against the creation of unpleasant odorsincidental to the operation of the burner.

A further object is to decrease the cost of production of Bunsenburners.

Other objects and advantages appear as the description progresses.

Natural gas has proved to be particularly disadvantageous for use in theconventional Bunsen burner. The gas appears to lack physical afiinityfor the atmosphere and forms an imperfect admixture with it. This gasalso requires a large volume of air to be mixed therewith to properlysupport combustion.

In the usual Bunsen burner, these factors result in incomplete anduneven combustion and carbonization of the flame. It has been foundImpossible to admit sufficient air into the burner by adjustment of theusual aspirator as the additional air does not properly mix with the gasand produces a roaring flame.

Broadly stated, the invention consists of providing a Bunsen burner witha plurality of independent aspirators to progressively increase theratio of air mixed with the natural gas. This also retards the progressof the current of gas through the burner thus permitting the gassufficient time to completely mix with the air before passing into theflame.

In this specification and the accompanying drawing the invention isdisclosed in its preferred form. It is to be understood, however, thatit is not limited to this form because it may be embodied in other formswithin the purview of the claim following the description.

In the accompanying one sheet of drawings:

Fig. 1 is a side elevation of a Bunsen burner constructed in accordancewith this invention.

Fig. 2 is a vertical section of the same.

In detail, the construction illustrated in the drawing comprises thebase 1, having the nipple 2 projecting laterally therefrom and adaptedto be telescoped within the usual gas supply tube. The gas inlet 3extends through the nipple 2 and intersects the vertical passage 4located axially of the base.

The upper portion of the passage 4 is internally threaded to engage thethreaded end 5 of the aspirator 6. The end of the aspirator has atapered opening therethrough into which is driven the nozzle 7 havingthe restricted orilies 8.

The aspirator includes the lower and upper heads 5 and 9, respectively,joined by the integral shrouds 10. The shrouds should be relativelynarrow in width to provide the maximum space for the entrance of airinto the aspirator.

The tubular stem 11 is adjustably threaded in the upper head 9 above theorifice 8 and is maintained in adjusted position by the knurled lockingnut 12. A second aspirator 13, similar to the aspirator 6, includes ahead 13 screwed onto the upper end of the stem 11. The end of the stempreferably projects above the head 13 as shown at 14 for reasonshereinafter more fully explained. The stem 11 discharges into therelatively large body of the burner tube 15 which is fixed in the upperhead 13" of the aspirator 13 and extends upwardly therefrom.

The flaring hood 16 has the inturned flange 17 resting on the top of theupper head 13 and depends downwardly therefrom to encircle the aspirator13. The hood prevents raw gas fumes from escaping upward from theaspirators 6 and 13.

The burner operates substantially as follows: Natural gas is suppliedfrom any service line through the usual rubber tube, not shown, andenters the burner through the inlet 3. A small volume of gas forciblyissues through the orifice 8 and is discharged into the larger spacewithin the tubular stem 11. This draws air from the atmospheresurrounding the aspirator, into the interior of the stem. The exactproportion of air admitted through the aspirator 6 can be regulated tomeet conditions by adjusting the stem 11 at 9.

As the gas and air rise within the stem, they become more or less mixedand blended as in the conventional Bunsen burner. Under the presentinvention, the mixture of gas and air is discharged from the upper endof the stem 11 and is infused with additional air in the aspirator 13 asit passes into the relatively large interior of the burner tube 15.

The upward draft of air created within the hood 16 by the operation ofthe aspirator, draws any incidental eddies of gas within the aspirator13 into the burner tube. The hood also serves to prevent the gas passingthrough the aspirator 13 from being diverted by side drafts. Theprojection of the end of the tubular stem at 14 assists the hood inpreventing escaping eddies of gas within the aspirator.

The second aspiration of air at 13 retards the progress of the currentof gas through the burner, thus allowing time for it to becomethoroughly mixed and infused with air in the burner tube before passinginto the flame at the upper end of the burner tube. The mixture of gasand air issuing from the end of the burner tube diffuses slowly, thuspermitting the gas to be completely consumed in the flame.

The relatively large volume of air mixed with the gas at 6 and 13permits complete oxidization of the hydrocarbon constituents of thenatural gas, thus insuring against the forma tion of free carbonparticles producing a yellow flame.

Having thus described the invention, what is claimed and desired to besecured by Letters Patent is:

A Bunsen burner having a base with a gas inlet; an aspirator includingan orifice discharging thereinto and communicating with said inlet and astem above said orifice and longitudinally movable with respect thereto;and a second aspirator including the upper end of said stem dischargingthereinto and a burner tube above said stem and longitudinally movablewith respect thereto.

ADOLF N. ROTH.

